Preparation and Hydration of Brownmillerite-Belite-Sulfoaluminate Cement

被引：4
作者：
Chen, Xuemei [1 ,2 ]
Li, Jun [1 ]
Lu, Zhongyuan [1 ]
Niu, Yunhui [1 ]
Jiang, Jun [1 ]
Xu, Yigang [2 ]
Zhong, Wen [2 ]
机构：
[1] Southwest Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Environm Friendly Energy Mat, Mianyang 621010, Sichuan, Peoples R China
[2] Jiahua Special Cement Co Ltd, Maanshan Jiufeng Rd, Shizhong Dist 614003, Leshan, Peoples R China
来源：
MATERIALS | 2022年 / 15卷 / 12期
关键词：
brownmillerite-belite-sulfoaluminate cement; hydration; mechanical performance; QUANTITATIVE PHASE-ANALYSIS; FLY-ASH; CALCIUM; YEELIMITE; KINETICS; DESIGN; GYPSUM; RATIO;
D O I：
10.3390/ma15124344
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Brownmillerite-belite-sulfoaluminate clinker with different contents of brownmillerite were designed and successfully prepared by using limestone (LS), aluminum tailings (AT), aluminum mine (AM), and anhydrite (AH) calcined at 1330 degrees C for 30 min. Then, three kinds of brownmillerite-belite-sulfoaluminate cement (BBSC) were obtained by grinding mixtures of the clinker and AH. Hydration and mechanical performances of the prepared BBSC were thus intensively studied. The increase in brownmillerite in BBSC decreased the hydration exothermic rate and delayed the renewed rapid formation of AFt at early hydration stages. However, the formation of C(2)AS center dot 8H(2)O would be promoted, where the higher the brownmillerite content in BBSC, the earlier the C(2)AS center dot 8H(2)O formed. The increase in brownmillerite might change the morphologies of the formed AFt, grass-shaped AFt enriched in iron would be the main hydration products in BBSC with a higher content of brownmillerite. The increase in brownmillerite content contributed to the stability improvement in flexural strength and the stable growth in the compressive strength of BBSC. The appropriate content of brownmillerite (20 wt%) can balance the whole hydration reaction process, which was conducive to the development of BBSC mechanical strength, the decrease in the hydration heat release, and the volume stability of hardened pastes.
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页数：15
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